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Abstract

Absolute wave numbers with a typical uncertainty of 1 MHz (95% confidence) were measured for 102 hyperfine-structure components of 127I2. The data cover the range 560 to 656 nm with no gaps larger than 50cm-1. The spectra were observed by use of Doppler-free frequency-modulation spectroscopy with a tunable cw laser. The laser was locked to selected iodine components, and its wave number was measured with a high-precision Fabry–Perot wavemeter. The accuracy of the results is confirmed by the good agreement of nine of the lines with previous results from other laboratories. These measurements provide a well-distributed set of precise reference lines for this spectral region.

References

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a Reference 1 with correction of Ref. 2.b The uncertainty in parentheses represents a 95% confidence interval.c The first comment line contains the following:

The number of hyperfine components.

A code describing the hyperfine structure as follows:

R, fully resolved;

U, not all components resolved;

W, widely distributed structure without six clear groups of components.

A list of pairs of components that were not resolved under our experimental conditions.

d A recorded scan is not available for this transition. Calculations show no adjacent or overlapping lines. Inspection of other transitions in this band indicate that these are the likely unresolved components.